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Schedule of Inventories (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Schedule of Inventory [Line Items]    
Raw materials $ 4,661,940 $ 4,064,317
Work-in-process 2,635,479 4,112,478
Finished products 2,966,813 2,966,900
Total $ 10,264,232 $ 11,143,695